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  1. #1

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    Jun 2021
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    2008 RXT-X only hitting 7500 RPMs?

    So i just picked up a 2008 RXT-X and it tops out at 7500RPMs and 64mph(GPS). It has a riva stage 1 kit on it minus the intake grate and was told by previous owner it did 72. It runs great other than not hitting top end.

    The supercharger was rebuilt 40 hrs ago and does have oil in the air intake. But the oil was right under full on the dip stick when i got it and it seemed to blow out oil until it got to half way between the bends on the dip stick. Now it seems to be holding there. Which i have read is normal for these motors.

    The prop and wear ring look good. What are your guys thoughts on this? I am leaning towards supercharger slipping to much but i am not for sure.


  2. #2
    Mod less, ride more! troyheb's Avatar
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    I would suspect the SC shaft seal is leaking but before you go there you need to clean you intercooler and your SC to IC hose and the IC to TB hose. After those are cleaned then you can be sure that it was only oil over fill.

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  4. #3
    tiderider's Avatar
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    Get rid of that junk. Anything over 10 years old will cost you a fortune...

  5. #4

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    Jun 2021
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    Quote Originally Posted by troyheb View Post
    I would suspect the SC shaft seal is leaking but before you go there you need to clean you intercooler and your SC to IC hose and the IC to TB hose. After those are cleaned then you can be sure that it was only oil over fill.
    Sounds good i will do that and then run a tank through it. Then i will reinspect everything, thanks!!

  6. #5
    RiverRat71's Avatar
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    Likely charger related. Pull it & rebuild it. Don't rely on when it was supposed to have been built. Oh, dont let dingdongrider discourage you. Anything without a warranty can "cost a fortune". RR

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